Generally 1/2 lb. of Crystal in my IPAs. I might go with a full lb. in something, but it's a balance between the body and sweetness and the hop bitterness. I want a nice amount of caramel flavor but not a lot of sweetness and body in an IPA.

An amber might get more than 1 lb of different crystals mixed together, when the body and sweetness is generally a bit more than an IPA.

I have a recipe for Bells Two Hearted that uses 12 lbs of base malt and 1/2 lb. of crystal.

__________________ If your takin' your girlfriend out tonight
You better park the car well out of sight
'Cos if they catch you in the back seat trying to pick her locks
They're gonna send you back to mother in a cardboard box !

I generally use 1/2lb of crystal in my beers. Like 1/2lb of crystal 20L in my light colored hybrid lager. gives it a Euro sort of sweet malt flavor that combines with the other malt & hop flavors to get that certain Euro kind of flavor quality. The WL029 yeast did a great job of balancing all of that. finish was a bit crisp as well. Kinda like an ice beer. But idk if I'd use more than 1/2lb in the average gravity beer.